I can't for the life of me figure this out!!!!

Sorry for the vague subject header, but this problem is driving me crazy!!! (Angry). I'm trying to figure out the average volume distribution on a daily basis within a month as a percentage contribution. In other words, every Monday in August accounts for 5% of our volume for that month, every Tuesday accounts for 3.5%, every Saturday accounts for 1.5%, etc.

Here is the data that I have:

1)Days in month =31

2)Weeks in month =4.4

3)# of occurances for each day within month:

Mon, Sat, Sun = 5

Tue-Fri =4

4)% Contribution for each day within a normal week

Monday =21%

Tuesday =18%

Wednesday =17%

Thursday =16%

Friday =18%

Saturday =8%

Sunday =2%

5)Average Day contribution to week (day/days in week) =14.3%

6)Average Daily Contribution to month (day/days in month) =3.2%

How do i calculate the Daily contribution for each day over a month? Could anyone give me a hand?